Structure of a Chromosome
The centromere is a constricted point where the 2 chromatids are held together. Chromatids are the arms of the chromosome; each chromosome has a short arm, designated as "p," and a long arm, designated as "q." Telomeres are regions at the ends of each arm of a chromosome. DNA molecule is strands of DNA that are formed into compact structures inside of the chromosome by proteins called histones.
Credit: GWEN SHOCKEY / SCIENCE PHOTO LIBRARY
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